This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A070208 #10 Feb 16 2025 08:32:46 %S A070208 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0, %T A070208 0,2,0,0,0,0,0,0,0,0,0,0,0,2,0,2,0,0,0,3,0,0,0,0,0,0,0,0,0,3,0,0,0,0, %U A070208 0,0,0,3,0,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,2 %N A070208 Number of integer triangles with perimeter n having integral area but not integral inradius. %C A070208 a(n) = A051516(n) - A070201(n). %D A070208 Mohammad K. Azarian, Circumradius and Inradius, Problem S125, Math Horizons, Vol. 15, Issue 4, April 2008, p. 32. Solution published in Vol. 16, Issue 2, November 2008, p. 32. %H A070208 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Incircle.html">Incircle</a>. %H A070208 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HeronsFormula.html">Heron's Formula</a>. %H A070208 R. Zumkeller, <a href="/A070080/a070080.txt">Integer-sided triangles</a> %K A070208 nonn %O A070208 1,36 %A A070208 _Reinhard Zumkeller_, May 05 2002